Trussed sheet



Aug. 3 192e. Y 1,594,609

H. F. FRE-ASE TRUssED SHEET n Filed July 31, 1924 1 v .3 sheets-Sheet 1 l gva/ventola Hrxflmzeidfm f M Aug. 3 1926.

H. F. FRI-:ASE

TRUSSED SHEET Filed July 3l, 1924 3 Sheets-Sheet 2 NWNII- y jnventv Hardin! f'eldfv'ease 55mg gg. 5I

Aug. 3 1926.

. H. F. FREASE TRUSSED SHEET Filed July 51, 1924 s sheets-sheet ajrfLlrur/al Field Frease hw/14 a?? M atto/(nega lit star

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TELUSSED .application filed July 3l, 1924i. No.. ,mt.

rlhe invention relates to sheet material, preferably metal, which is adapted toreslst structural loads; and the object of the 1mrovement is to provide sheet material having vformed 'therein two or more series of truss members angular to the plane of the sheet, the members meetingv each other at intersections and being fastened to each other at the intersections to form trussed sheets adapted to resistl loads applied from any d1- rection;

Sheet material having parallel. corrugations is weak against loads apphed transverse the corrugations. Stamping has been employed to rectify this weakness by pressing or stamping a truss formation in the sheet. l

In the stamping operation, however, the members of the truss formation are necessarily stretched thinner than the sheet, and the depth ci such truss members is therefore limited because ci this necessary stretching oir the material. Consequently it is impracj tical to provide by corrugating or stamping,

a sheet material adapted to resist loads of a wide range ci magnitude and appiied from any direction.

These diiiiculties are overcome by the pres ent invention, in which two or more series of rib truss members having any desired depth are folded. or formed in a sheet without stretching the ribs, and are contracted into junction with each other at intersections, and then :fastened to each other at the in tersection to form trussed sheets.

Several forms of the invention are illusm trated by the accompanying drawings ormingapart hereof, 'in whichlill re 1 is a fragmentary oblique pern spectiiie view oit one tornil of trussed sheet; Fig. 2, a 'fragmentary plan v iew of the sheet blank for 'the same, showing the rib tongues cut out, and indicating the lines of told for the ribs.;

.Fig 3, a fragmentary plan view ot the blank partially formed to make the trussed sheet;

a cross section of the same on line Fi t,

-glV, Fig. 3; n Fig. 5, a plan view of the sheet blank for another form of trussed sheet;

Fig ti, e plan view of the finished trussed sheet made from the blank of Fig. 5;

Fig. 7, a cross-section of the same on line VII-VH, Fig. 6; and

Figs. 8, 9, l() and 11, cross-sections oi? various modified rib truss members.

Similar numerals refer to. similar parts throu houtthe drawings.

Re erring to Figs. l, 2, 3, and 4, S" in 00 Fig.`2 is the blank. SI in Figs. 3 and 4 is the partially formed blank, and S of Fig. 1 is a completed :fragmentary portion oi one form of trussed sheet.'

The trussed' sheet S includes sheet panels 05 l, integral with two series of folded ribs 2 and 3, having tongues 2 and 2", and 3 and 3", at the respective ends thereof, the ribs meeting each other at intersections J, and being fastened to each other at the intersections by spot welds, not shown, which join the tongues 2* and 2 to the ribs 3, and the tongues 3 and 3h to the ribs 2. Rivets, eyelets or other iastening means may be used instead oit spot Wolde to giointhe tongue to the ribs, or the tongues may be entirel dispensed with and the ribs joined to eac other atthe intersections by means of solder or are welding, or other means.

The ribs 2 and 3 consist of folds of mate- 80 rial having two opposing plies 2. and 2, and 3 and respectively, and thus each rib truss member has a two ply rectangular cross section. in which the material in each ply is ci the saine thickness as the material ai in the sheet.

The ribs may be folded and formed without reducing the thickness of the material into other crosssections as illustrated in.4

Figs. 8 to 11 inclusive. Fig. 8 illustrates a '00 pierced as in Fig. 2, to permit the intersecting ribs to be folded and contracted 10 into the sheet. lt is preferable to pierce the sheets to provide for the rib tongues as shown. One series of ribs are then folded and formed into the sheet, and the'tongues bent back as shown in Figs. 3 and 4; after which the intersectin series is folded, its tongues bent back an the ribs and tongues fastened to each other at the intersections to form the trussed sheet of Fig. 1.

Although a truss may be folded into a sheet without piercing the sheet, if the sheet be sufficiently thin, it is preferable that the ends of the truss member be separated from each other by piercing the blank, as illustrated.

The trussed sheet 0f Figs. 1 to 4 inclusive consists of two series of ribs intersecting at right angles to each other and being at right yangles to the plane of the lsheet panels. It is obvious that the ribs may be at any other desired angle with each other and with the sheet anels.

Moreover more t an two series of intersecting ribs may be folded into the sheet. Fig. 5 illustrates the sheet blank Sb, and Figs. 6 and 7 the trussed sheet Sl made therefrom, wherein four series of intersecting ribs have been folded into the sheet, the tongues tucked in at the intersections, and the ribs fastened to each other to form the truss.

The trussed sheet S1 includes triangular sheet panels 11, 11, 11", 11, and 11d, integral with, as shown, the series of intersecting folded ribs 12, 18, 14, and 15, there being rib tongues 12a andl 12", 13 and 13b, 14a and 14h, and 15a and 15b 0n the respective ends thereof, the tongues being tucked in between the rib plies at the intersections,

' and the ribs being joined to each other at the intersections by means of spot welds not shown.

The rib truss members of the trussed sheets are obviously strengthened by the sheet panels against lateral deflection.

The invention thus provides asheet material having formed and fastened therein a true truss angular to the plane of the sheet and adapted to resist loads of any practical magnitude and distribution, and applied from any direction.

The proper shape of the panels, and the Iproper depth and cross-section of the ribs may be determined by the conditions under whlch any given trussed sheet is to be used.

The trussed sheets have a wide range ,of usefulness in many different kinds of structures, .particularly where it is desired to utilize the lightness and strength of sheet metal without being subject to the tendens to buckle of large unsupported areas. Suc v structures include at the one extreme, panel forms for concrete; and, at the other, .external surface members for air craft.

The trussed sheets may be considered from another stand-point to be made up of a lurality of box panels, the panel box sides being integral witheach other edgewise, and fastened to each other endwise to form a truss.

I claim:

1. A sheet having a plurality of inte ral box panels, the box sides being folde in the sheet, integral with each other edgewise, and being intersections to form a truss.

2. A sheet having a plurality of integral square box panels, the box sides bein folded in the sheet and integral with eac other edgewise, andbeing fastened to each other endwise at interseetlons to form a truss.

3. A sheet having a plurality of integral triangular box panels, the box sides bein folded in the sheet and integral with eaclg. otherl edgewise, other endwise truss.

4. A sheet having a plurality of integral polygonal box panels, the box sides being folded in-thesheet and integral with each other edgewise, and being fastened to each other endwise at intersections to form a truss;

5. A trussed sheet including sheet panels integral with truss members having separate ends meeting each other at intersections and being fastened to each other at the intersections to form a truss.

6. A trussed sheet including sheet panels integral with two or more series of truss at intersections to form a members having separate ends meeting each other at intersections and being fastened to each other at the intersections to form a truss.

7. A trussed sheet including sheet panels integral with truss members having separate ends meeting each other at intersections and being fastened to each other at the intersections to form a truss, some of the ends being provided with tongues, and the tongues being fastened to the other ends at the intersections. y

8. A trussed sheet including sheet panels integral with truss members having separate ends meeting each other at intersections and being fastened to each other at the intersections to form a truss, the members consisting of a plurality of plies of the sheet.

9. A trussed sheet including sheet panels integral with folded truss members having separate ends meeting each other at intersections and being fastened to each other at the intersections to form a truss.

10. A trussed sheet including sheet panels integral with folded and formed truss members having separateends meeting each other at intersections and being fastened to each other at the intersections to form a truss.

In testimony that I claim the above, I have hereunto subscribed my name. l

HURXTHAL FIELD FREASE.

and being fastened to each fastened to each other endwise at 

